TRAFFIC SUPERVISOR CERTIFICATION EXAM
2026/2027 – REAL EXAM QUESTIONS AND
ACCURATE CORRECT ANSWERS.
◎ The off peak 85th percentile. Which is the speed at or below which 85% of vehicles
travel operating speed in free flow conditions ANSWER:- speed used in formulas should
be
◎ 125' ANSWER:- Distance of L for 25 MPH with 12' Lane width
◎ 245' ANSWER:- Distance of L for 35 MPH with 12' Lane width
◎ 540' ANSWER:- Distance of L for 45 MPH with 12' Lane width
◎ 660' ANSWER:- Distance of L for 55 MPH with 12' Lane width
◎ 780' ANSWER:- Distance of L for 65 MPH 12' Lane width
◎ L Minimum ANSWER:- Merging Taper Length
◎ 1/2 L Minimum ANSWER:- Shifting Taper Length
◎ 1/3 L Minimum ANSWER:- Shoulder Taper Length
◎ 50'-100' regardless of speed
6 devices 10'-20' apart ANSWER:- One-Lane, Two-Way Taper (Flagger taper) Length
and number of devices
◎ 50'-100' per lane ANSWER:- Downstream taper Length
◎ 2L ANSWER:- Tangent distance (between tapers)
◎ 1/2L ANSWER:- Tangent distance before shifting taper
◎ Buffer Space
Work Space
Traffic Space ANSWER:- Activity Area Sub-components (3)
◎ Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator, equipment, or materials
, STRONGLY RECOMMENDED: unless there is a documented reason not to ANSWER:-
Longitudinal Buffer Space
◎ Where road users are returned to their normal path
extends from the downstream end of the work area to the last device such as end work
zone sign
May contain:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane ANSWER:- Termination Area is:
can contain: (2)
◎ 100' ANSWER:- Recommended Advanced Warning Sign Spaceing: Urban (low
speed)
◎ 350' ANSWER:- Recommended Advanced Warning Sign Spaceing: urban (high
speed)
◎ 500' ANSWER:- Recommended Advanced Warning Sign Spaceing: Rural
◎ 1000', 1500', and 2640' ANSWER:- Recommended Advanced Warning Sign
Spaceing: freeways and expressways (3)
◎ 1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside
taper. ANSWER:- Arrow board visibility distance by design:
night time dimming:
location:
◎ taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit ANSWER:- device spacing taper:
tangent:
◎ A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn ANSWER:- Warning lights types:
Type A:
Type B:
Type C:
Type D:
◎ Uses for portable changeable message sign PCMS ANSWER:- speed drops
significant delays
2026/2027 – REAL EXAM QUESTIONS AND
ACCURATE CORRECT ANSWERS.
◎ The off peak 85th percentile. Which is the speed at or below which 85% of vehicles
travel operating speed in free flow conditions ANSWER:- speed used in formulas should
be
◎ 125' ANSWER:- Distance of L for 25 MPH with 12' Lane width
◎ 245' ANSWER:- Distance of L for 35 MPH with 12' Lane width
◎ 540' ANSWER:- Distance of L for 45 MPH with 12' Lane width
◎ 660' ANSWER:- Distance of L for 55 MPH with 12' Lane width
◎ 780' ANSWER:- Distance of L for 65 MPH 12' Lane width
◎ L Minimum ANSWER:- Merging Taper Length
◎ 1/2 L Minimum ANSWER:- Shifting Taper Length
◎ 1/3 L Minimum ANSWER:- Shoulder Taper Length
◎ 50'-100' regardless of speed
6 devices 10'-20' apart ANSWER:- One-Lane, Two-Way Taper (Flagger taper) Length
and number of devices
◎ 50'-100' per lane ANSWER:- Downstream taper Length
◎ 2L ANSWER:- Tangent distance (between tapers)
◎ 1/2L ANSWER:- Tangent distance before shifting taper
◎ Buffer Space
Work Space
Traffic Space ANSWER:- Activity Area Sub-components (3)
◎ Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator, equipment, or materials
, STRONGLY RECOMMENDED: unless there is a documented reason not to ANSWER:-
Longitudinal Buffer Space
◎ Where road users are returned to their normal path
extends from the downstream end of the work area to the last device such as end work
zone sign
May contain:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane ANSWER:- Termination Area is:
can contain: (2)
◎ 100' ANSWER:- Recommended Advanced Warning Sign Spaceing: Urban (low
speed)
◎ 350' ANSWER:- Recommended Advanced Warning Sign Spaceing: urban (high
speed)
◎ 500' ANSWER:- Recommended Advanced Warning Sign Spaceing: Rural
◎ 1000', 1500', and 2640' ANSWER:- Recommended Advanced Warning Sign
Spaceing: freeways and expressways (3)
◎ 1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside
taper. ANSWER:- Arrow board visibility distance by design:
night time dimming:
location:
◎ taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit ANSWER:- device spacing taper:
tangent:
◎ A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn ANSWER:- Warning lights types:
Type A:
Type B:
Type C:
Type D:
◎ Uses for portable changeable message sign PCMS ANSWER:- speed drops
significant delays
